Wood-ash furnace and extract-boiler



E. W. EISENHAU'EH, ln., L. F. FLOHMANNIAND' E. C. A. WOLTMANN.

WOOD ASHHFURNACE AND EXTRACT BOILER.

APPLICATION man 1AN.28, 1.919,

2 SHEETS-SHEET 2.

lu/vanto acuda :xfa/r nen u.

EDWARD W. EISENHAUER, JR., OF'LOSZAN'GELES, LOUIS F. FLORIVIANN, OF SILVER LAKE, AND EMILE. A, WOLTMEANN, OF LOS ANGELES, CALIFOIRNIA.4

To allwhomc't mag/.concern Be it known thatl weEDWARD W. EI'sEN- HAUER, J r., Louis F. FLORMANN, and EMIL G. A. WOLTMANN, c'itizens'ofi the United States, the said! E1sENHAUER,Jrf., and VVOLTMANNA residents ofi Los Angeles, Los Angeles; county, State of California, .and said FLoRuANN resident ofy Silver; Lake, SanV Bernardino county, Staten-ofl California, havevr invented certain newl andV useful Improvementsin-,WoodeAsh Furnaces and EX- tractL-Boilers, of' which theK following'isl aspecification. A

Our invention relates-.to the classv of furnaces especiallyY adaptedfor the combustion of wood, .tofproduce the ash; and'inconnec.- tion; with said furnace, and asl a unitary part thereof, a digester for: the `leaves; in which anextract is-made, fromwhich avaluable product7 may behad.v f

The particular object: we f have f in view is the productionlof wood-ashboth for direct usel as a fertilizer, and` for the'recovery of its potash and other content A-'further object is the'V production oftannic acid.

Ithas been' known for some timcftha-t grease-wood, apricklyv shrub foundl eXtensively on the'alkalineplains of this countryfis'rich in potash (KZC) and we have found further that its leavesl areavailable for the production of tannin.

Onv account ofi thegnature of grease-Wood, probably because of.` its oily content, it burns with a fierce heat; and it issomewhat diiiicult to-so controlitscombustionias to avoid appreciable loss by.k volatilization.

The .object of ourI inventionv isf to provide afurnace inwshich combustion\vhile' constant. a-ndperfect,y is. under suchv control that little orno lossoccurs by Vvolatilization and all the ash is recovered free fromycoa-ls, and a furtherfobject isto unite withthe furnace,r a, boilerIk ordigester deriving thevheat therefrom, andin whichfthefleavesof the grease wood maybe treated toproduce an extract from; which4 tannic acid may.` be recovered.

To these ends our invention consists lin the novel furnace vand in the combination-therewithl of-itheextract-boiler, all of which. we

WOOD-ASH FURNACE. AND EXTRAGT-BOILER.

Specification of Letters Patent. Patented June l, 1920.

ApplicationV filed`A` January 28, 1919'.

Serial No.` 273,624.

shall herein fully describe by referenceA to the accompanying drawingsin Which;-

Figure 1 is a verticalsectionof our furnace and'boile'r, on the line 1 1v of Fig. 2.

Fig; 2 is a, horizontal section onethe line 2.--2,O` Fig. 1.

Fig. 3 isH-asectionalview showing a modiicationinthe means for obtaining the ash free from coals'.

y The furnace comprises .a shellf 1 of any suitable construction, having a combustion chamber 2 and anfash pit 3.- In the shell is fitted freely the grate 1; which yis supportedf at; itssidesonlugs 5. At 'its inner end it is supported by an arm or bar 6 which lies freely upon a shoulderv at7. At its outer 'end a bar 8 secured to or formed with the grate -protrudes through the wall of the shellin a verticalslot yQthereingand under said protruding., bar' works a continuously revolving caIn.10,on ashaft 11 drivenby` a pul1ey12.l Y fv The effect of the cam playing underI the bar 8 is tolift the grate on the'shoulder 7 as a fulcrum, andto drop-it again, thereby imparting toit a Vertical jarring motion,

the tendency of which iseto .continuously sift Y the ash` and keepfthe grate clear.

In thel ash pit-.3 is located aninclined screen-13 to which thefupper walls of the pit. converge, sol that all material passing through thev grate-.plate falls upon the screen.. The foot` of the screen 18 projects to the exterior of the ash pitand said pit is provided with a door 14 toiremove4 the Upon top of the.,furnaceshell is-;fitted ahood 15 having` an eXritflue 16 for the gaseous products Y of combustion.v

17 is a feed elevator' which delivers the material-into the upper portion of the shell.

18 is aboiler or digester vesselhaving a drain 19.

The` digesting: liquid, such. as water, cir-v culates through-a lower pipe 20, a pipek 21, inpractice acoil, located in asuitableiposition.y within the combustionA chamber; 2. of the furnace. shell l, and anupper'pipe' '22. Thus the heat ofthe furnace is .utilized to heat therboiler.' water;A Y

vWithin the boiler 18 is suspended, by the lines 23, the strainer vessel 211. The screen bottom 24 of the vessel is hinged at one side at 25 and is provided with a trip 26 at the other side.

' nature of the wood and as it proceeds, the

continuously jarre, grate-plate, sifts the ashes through. Some particles, still unconsumed, will, aslive coals, also sift through, but as all these together with the ash fall Y upon the screen 13 in the ash pit, these coals 'ash from the wood, it will be seen that the failing to pass through the screen, are separated from the ash which passes through into.' the pit. The coals are delivered exteri- 'orly by the screen 13 and may be run over again through the furnace. The ashes in the pit may be removed and marketed and used as such for fertilizer, or from them the potash may be recovered and sold, according to thecustoms or exigencies of business.

.Certain substances-of value, such for eX- ample as iodin, which may volatilize and tend to pass off with the unconden'sable or fixed gaseous' products Vof combustion, will be condensed upon the hood 15 from which they may be recovered.

The leaves of the grease-wood, we supply in batches to the strainer vessel 24. When sufficiently. Vdigested in the hot water which derives it heat from Vits circulation through the pipe 21 in the furnace, the strainer vessel is hoistedV from the boiler and the bottom 24 of the vessel being tripped, Vthe contents are discharged and a fresh batch of leaves supplied, the hinged bottom being first restored to position. VThen the strainer vessel is returned to the boiler. The extracty is drawn ofi1 through'the drain 19 and the tannic acid recovered. Y n

In the furnace operation of producing the function of the screen 13 in the ash pit is to obtain a pure ash. VThis result may be reached by other means; and7 for an example of such variation, we show in Fig. 3 a

modification, in which the screen 13 is omitted, a blower 27 is applied to one side of the ash pit. lThe blower is best set at a shght angle in order to direct its air current downwardly, and thereby avoid an updraft, while serving to act chiefly upon the falling material. This air blast tends to fully consume the falling coals, and to blow all the residue thus fully reduced to ash out through a neck 28 into a bin 29 provided with air exit screens 30 and an agitator 31, which latter may be used to prevent the ashes from clogging in the bin, and to facilitate their discharge through the gate 32 ,of the bin, at such Vintervals as may b e ing through the grate to obtain the ash free fromcoals.

2. A furnace for the described purpose comprisingY a shell having a Acombustion chamber and an ash pit; a grate in the shell dividing said chamber from the pitgan elevator for feeding the material to the com! bustion chamber; means Vfor continuously Vagitatingl the grate comprising an operating member coperatingV with said grate for moving the same; and means affecting the material falling through the grate toobtain the ash free from coals.

3. A furnace for the described purpose comprising a shell, having av combustion chamber and lan ash pit; a tiltable grate freely fitted 'in' the shell between the chamber and pit; a continuously rotating cam acting on one side of said grate to `raise and drop it whereby it is continuously jarred, and means affecting the material falling through the grate to obtain the ash free from coals.

4. A furnace for'the describedv purpose comprising a shell, having a combustion chamber and an ash pit; a tiltable grate freely fitted in the shell between the chamber and pit; a continuously rotating cam acting on one side' of said'grate to raise and drop it-whereby it is continuously jarred; and means affecting the material falling through the grate to obtain the ash free from coals consisting Vof a screen in the ash pit leading to the exterior.

5. A furnace for the described purpose comprising a shell, having a combustion chamber and an ash pit; a tiltable grate freely fitted in the shell between the chamber and pit, a continuously rotating cam acting on one side of said grate to raise and drop it whereby it is continuously jarred; means affecting the material falling through the grate to obtain the ash free from coals, consisting of a screen in the ash pit leading to the exterior; and an elevator for feeding the material to the combustion chamber.

In testimony whereof We have signed our names to this specification in the presenceof tWo subscribing Witnesses. e

EDWARD VW. EISENHAUER, JR. LOUIS F. FLO'RMANN. EMIL C. A. WOLTMANN. Witnesses:

C. SHORTREED, JUSTINE OTToFY. 

